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Chapter 8 EVOC 20 PolySynth 143
EVOC 20 PolySynth noise generator
The noise generator provides a further sound source that can be used alongside the
two oscillators.
Important: The noise generator in the oscillator section is independent of the noise generator in
the U/V detection area. For further information about voiced and unvoiced signals, see EVOC 20
PolySynth (U/V) detection parameters on page 138 .
Noise generator parameters
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Level knob: Rotate to control the amount of noise added to the signals of the two oscillators.
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Color knob: Rotate to set the timbre of the noise signal. Turn full-left to hear white noise. Turn
full-right to hear blue noise (high-passed noise). White noise has traditionally been used to
create wind and rain sound eects. It has the same energy in each frequency interval. Blue
noise sounds brighter, because its bass portion is suppressed by a highpass lter.
Tip: Set Color to the full-right position and Level to a very low value to achieve a lively and
fresh synthesis signal.
EVOC 20 PolySynth tuning and pitch parameters
The parameters at the lower left of the interface are used to control the overall tuning and other
pitch-related aspects of the EVOC 20 PolySynth sound.
Tuning and pitch parameters
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Tune eld: Drag to set the overall tuning of the EVOC 20 PolySynth, in cents. One hundred cents
equals one semitone step.
•
Analog knob: Rotate to set the amount of random pitch detuning. Analog simulates the
instability of analog circuitry found in vintage vocoders by randomly altering the pitch of each
note. This behavior is much like that of polyphonic analog synthesizers.
•
Glide knob: Determines the time it takes for the pitch to slide from one note to another—
portamento. Also see EVOC 20 PolySynth global parameters on page 145 for information about
mono and legato mode.
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Bend Range eld: Drag to determine the pitch bend modulation range, in semitone steps.